A video game system that normally sells for $249 is on sale 15% off. Which expression can be used to find the amount of the disc
ount? Select all that apply.
2 answers:
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Either order is correct.
Small example: let's take
. Then
By the commutative property, we can write
By the associative property, we can regroup consecutive terms.
By the associative property again, we can regroup terms and write
Commutativity:
Associativity:
You can show by induction that this holds in general for
so that 
.
Small example: let's take
By the commutative property, we can write
By the associative property, we can regroup consecutive terms.
By the associative property again, we can regroup terms and write
Commutativity:
Associativity:
You can show by induction that this holds in general for